We have some performance tests with iSCSI and NFS but nothing specific to your setup.
Please email me and I will send you what I have. As there are many variables in testing due to many hardware and environment conditions it is very difficult to provide test for all.
One Forum user "jmo" is very knowledgeable with XEN and has helped many users here with his experience, he might have some results on IOPs that he as experienced.
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